An object with a mass of $3 kg$ , temperature of $170 ^oC$ , and a specific heat of $22 J/(kg*K)$ is dropped into a container with $18 L$ of water at $0^oC$ . Does the water evaporate? If not, by how much does the water's temperature change?

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Answer 1 · 2017-06-27T05:31:24

The water does not evaporate and the change in temperature is $=0.15ºC$

The heat is transferred from the hot object to the cold water.

Let $T=$ final temperature of the object and the water

For the cold water, $Delta T_w=T-0=T$

For the object $DeltaT_o=170-T$

$m_o C_o (DeltaT_o) = m_w C_w (DeltaT_w)$

$C_w=4.186kJkg^-1K^-1$

$C_o=0.022kJkg^-1K^-1$

$3*0.022*(170-T)=18*4.186*T$

$170-T=(18*4.186)/(3*0.022)*T$

$170-T=1141.6T$

$1142.6T=170$

$T=170/1142.6=0.15ºC$

As $T<100ºC$ , the water does not evaporate

An object with a mass of 3 kg3 kg, temperature of 170 ^oC170 ^oC, and a specific heat of 22 J/(kg*K)22 J/(kg*K) is dropped into a container with 18 L 18 L of water at 0^oC 0^oC . Does the water evaporate? If not, by how much does the water's temperature change?